# How to do inequalities on a graph

Graph Inequality on Number Line

Step 1 We must solve for one unknown in one equation. We can choose either x or y in either the first or second equation. Step 2 Substitute the value of x into the other equation. In this case the equation is 2x + 3y = 1. Substituting (4 + Step 3 Solve for the unknown. Remember, first remove. Graphing inequalities is very similar to graphing linear equations. Once your linear equation is graphed, you then must focus on the inequality symbol and perform two more steps. It's pretty easy and fun. Stick with me and you'll have no problems by the end of this lesson. This is a graph for a linear inequality.

Once your linear equation is graphed, you how to do inequalities on a graph must focus on the inequality symbol and perform two more steps.

It's pretty easy how to do inequalities on a graph fun. Stick with me and you'll have no problems by the end of this lesson. This is a graph for a linear inequality. Notice how we have a boundary line that can be inequaltiies or dotted w we have a half plane shaded. Hint: These are the two extra steps that you must take when graphing inequalities. In order to succeed with this lesson, you will need to remember how to graph equations using slope intercept form.

As shown in this image, the first step will be to determine whether grapph will use a solid boundary line or a dashed boundary line. The inequality symbol will help you to determine the boundary indqualities. If the inequality symbol is greater than or less than, then you will use a dotted boundary line. This means that the solutions are NOT included on the boundary line. If the inequality symbol is greater than or equal to or less than or equal tothen you will use a solid line to indicate that the solutions are included on the boundary line.

If this all sounds confusing, don't worry Take a look at the examples below and it will all make sense. You may want to keep this handy for a reference. Step 1: Graph the inequality as vraph would a linear equation. Remember to determine whether the line is solid or dotted. The points on the line are NOT solutions! Step 2 infqualities Determine which side of the line contains the solutions. Since y is less than the expression, you will shade belo w the line.

If you are unsure of which side to shade, pick any point on the graph that's not on the line. You are choosing a test point to determine which side contains the solutions.

I will choose 0,0 because what is the audit number on drivers license is the easiest point to substitute into the inequality to check for solutions. Since 0,0 is a solution and is to the right of the line, ALL of the points to the right of the line are solutions!

Therefore, we will lightly shade the area to the right of the line to show that this niequalities of the line contains all of the solutions to the inequality. Did you notice how our boundary line was a dotted line because of the less than symbol that was used in the inequality?

Also, you may have realized that you shade below the dotted line because of the less than symbol in the inequality. However, vernier calliper how to use you are unsure you can always choose a test point.

I always use the point 0,0 if it's not on the line. Substitute 0,0 into the original inequality. If the math sentence is true once you substitute 0,0then that means that 0,0 is a solution and you shade the half plane that contains 0,0.

If the math sentence is false when you substitute 0,0then that means that 0,0 is not a solution and the other half plane or the side of the line that does not contain hoow should be shaded.

For this second example, we'll need to rewrite the equation so that it's in slope intercept form before graphh graph. Also take note that the sign is greater than or equal to, so we will graph a solid line this time instead of a dotted line. This inequalitties will also how to cook pork burgers in the oven how to choose three solutions to the inequality.

Graph the following inequality. Then identify three solution to the inequality. Step how to unlock samsung c3050 : We need to rewrite oj inequality so that it is in slope intercept form. Step 2 : Graph the line. Note that the line is solid because the inequality sign is greater than or equal to. Step 3 : Shade the solution inwqualities.

Since y is greater than the expression, shade the side "above" the line. If you are unsure, pick a "test" point to determine which side of the line you should shade to geaph the solutions to the inequality. Step 5 : Identify three points that are solutions to the inequality. This means that you can pick any three points that are in the shaded area. You may have chosen three completely different solutions, but as long as inequapities are contained in the shaded area, they are solutions to the inequality.

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Algebra Class. Graphing Inequalities Graphing inequalities is very similar to graphing linear equations. Ineualities We would love to hear what inequslities have to say about this page! Need Help? Try Gralh Online Calculator! Affiliate Products Let Us Know How we are doing!

How to Graph a Linear Inequality

Now an inequality uses a greater than, less than symbol, and all that we have to do to graph an inequality is find the the number, '3' in this case and color in everything above or below it. Just remember. if the symbol is (? or ?) then you fill in the dot, like the top two examples in the graph below. The two inequalities, x ? 0 and y ? 0, are what keep the graph of the system in the first quadrant. The values of x and y are never negative in a system with this requirement; they have to be positive or zero. In this almond-and-peanut situation, you can’t have a negative number of ounces, so the inequalities fit. Feb 17,  · Four worked-out examples demonstrating two techniques (primarily using logic) for determining where the shading goes, when graphing a linear tiktokdat.com f.

In previous chapters we solved equations with one unknown or variable. We will now study methods of solving systems of equations consisting of two equations and two variables. Upon completing this section you should be able to: Represent the Cartesian coordinate system and identify the origin and axes.

Given an ordered pair, locate that point on the Cartesian coordinate system. Given a point on the Cartesian coordinate system, state the ordered pair associated with it. Note that this concept contains elements from two fields of mathematics, the line from geometry and the numbers from algebra. Rene Descartes devised a method of relating points on a plane to algebraic numbers.

This scheme is called the Cartesian coordinate system for Descartes and is sometimes referred to as the rectangular coordinate system.

Perpendicular means that two lines are at right angles to each other. The number lines are called axes. The horizontal line is the x-axis and the vertical is the y-axis. The zero point at which they are perpendicular is called the origin. Axes is plural. Axis is singular. The arrows indicate the number lines extend indefinitely. Thus the plane extends indefinitely in all directions.

The plane is divided into four parts called quadrants. These are numbered in a counterclockwise direction starting at the upper right. Points on the plane are designated by ordered pairs of numbers written in parentheses with a comma between them, such as 5,7. This is called an ordered pair because the order in which the numbers are written is important. The ordered pair 5,7 is not the same as the ordered pair 7,5. Points are located on the plane in the following manner. First, start at the origin and count left or right the number of spaces designated by the first number of the ordered pair.

Second, from the point on the x-axis given by the first number count up or down the number of spaces designated by the second number of the ordered pair. Ordered pairs are always written with x first and then y, x,y. The numbers represented by x and y are called the coordinates of the point x,y. This is important. The first number of the ordered pair always refers to the horizontal direction and the second number always refers to the vertical direction.

Check each one to determine how they are located. What are the coordinates of the origin? Upon completing this section you should be able to: Find several ordered pairs that make a given linear equation true. Locate these points on the Cartesian coordinate system. Draw a straight line through those points that represent the graph of this equation.

A graph is a pictorial representation of numbered facts. There are many types of graphs, such as bar graphs, circular graphs, line graphs, and so on. You can usually find examples of these graphs in the financial section of a newspaper.

Graphs are used because a picture usually makes the number facts more easily understood. In this section we will discuss the method of graphing an equation in two variables. In other words, we will sketch a picture of an equation in two variables. All possible answers to this equation, located as points on the plane, will give us the graph or picture of the equation.

A sketch can be described as the "curve of best fit. Remember, there are infinitely many ordered pairs that would satisfy the equation. Solution We wish to find several pairs of numbers that will make this equation true. We will accomplish this by choosing a number for x and then finding a corresponding value for y. A table of values is used to record the data. In the top line x we will place numbers that we have chosen for x.

Then in the bottom line y we will place the corresponding value of y derived from the equation. Of course, we could also start by choosing values for y and then find the corresponding values for x. These values are arbitrary. We could choose any values at all. Notice that once we have chosen a value for x, the value for y is determined by using the equation. These values of x give integers for values of y.

Thus they are good choices. Suppose we chose. We now locate the ordered pairs -3,9 , -2,7 , -1,5 , 0,3 , 1,1 , 2,-1 , 3,-3 on the coordinate plane and connect them with a line.

The line indicates that all points on the line satisfy the equation, as well as the points from the table. The arrows indicate the line continues indefinitely. The graphs of all first-degree equations in two variables will be straight lines.

This fact will be used here even though it will be much later in mathematics before you can prove this statement. Such first-degree equations are called linear equations. Equations in two unknowns that are of higher degree give graphs that are curves of different kinds.

You will study these in future algebra courses. Since the graph of a first-degree equation in two variables is a straight line, it is only necessary to have two points. However, your work will be more consistently accurate if you find at least three points. Mistakes can be located and corrected when the points found do not lie on a line. We thus refer to the third point as a "checkpoint.

Don't try to shorten your work by finding only two points. You will be surprised how often you will find an error by locating all three points. Solution First make a table of values and decide on three numbers to substitute for x. We will try 0, 1,2. Again, you could also have started with arbitrary values of y. The answer is not as easy to locate on the graph as an integer would be. Sometimes it is possible to look ahead and make better choices for x. We will readjust the table of values and use the points that gave integers.

This may not always be feasible, but trying for integral values will give a more accurate sketch. We can do this since the choices for x were arbitrary. How many ordered pairs satisfy this equation? Upon completing this section you should be able to: Associate the slope of a line with its steepness. Write the equation of a line in slope-intercept form.

Graph a straight line using its slope and y-intercept. We now wish to discuss an important concept called the slope of a line. Intuitively we can think of slope as the steepness of the line in relationship to the horizontal. Following are graphs of several lines. Study them closely and mentally answer the questions that follow. If m as the value of m increases, the steepness of the line decreases and the line rises to the left and falls to the right.

In other words, in an equation of the form y - mx, m controls the steepness of the line. In mathematics we use the word slope in referring to steepness and form the following definition:. Solution We first make a table showing three sets of ordered pairs that satisfy the equation. Remember, we only need two points to determine the line but we use the third point as a check. Example 2 Sketch the graph and state the slope of.

Why use values that are divisible by 3? Compare the coefficients of x in these two equations. Again, compare the coefficients of x in the two equations. Observe that when two lines have the same slope, they are parallel. The slope from one point on a line to another is determined by the ratio of the change in y to the change in x.

That is,. If you want to impress your friends, you can write where the Greek letter delta means "change in. We could also say that the change in x is 4 and the change in y is - 1. This will result in the same line.

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